JavaScript Array keys() Method

　JavaScript Array Object

The JavaScript array keys() method returns a new array iterator object that contains the keys of each index in the array.

Syntax:

array.keys()

var alpha = ['A', 'B', 'C', 'D', 'E'];
var iterator = alpha.keys();

Browser Compatibility

The numbers in the table specify the first browser version that fully supports the keys() method:

Technical Details

　JavaScript Array Object